# Copyright 2020 Makani Technologies LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Utilities in rendering HTML."""

from django import template

register = template.Library()


# {{ mydict|lookup:item.name }}
# {{ mylist|index:foo.counter }}
@register.filter(name='attr')
def attr(value, arg):
  try:
    return value[arg]
  except KeyError:
    return ''


@register.filter(name='has')
def has(value, arg):
  return arg in value
